924Board.org

[Joes924]

Thank you ..
Yes Richard I am..It only took 4 hrs to do it. http://home.attbi.com/~joedanka/June924/topend.JPG
http://home.attbi.com/~joedanka/June924/pan.JPG

Show you some rod bearings Wed. Ok.



[ This Message was edited by: Joes924 on 2002-08-21 17:00 ]

[ This Message was edited by: Joes924 on 2002-08-21 17:01 ]

[wdb]

I dont know how much you know about rebuilding an engine so just to be sure you dont miss anything important .if the knocking you heard was caused by your rod bearings , the noise was caused by your rods pounding on your crankshaft which will beat your crank and rods out of round . the crank could be reground and reused with over sized bearings if the damage is not to bad,but the rods have to be replaced ,they cant be fixed . your head and block should be disassembled and taken to a machine shop to be boiled to clean it out , making sure there is no sludge or metal left in the oil passages. the main bearing jounals need to be measured with a micrometer to check for damage as well as the wrist pin bore on the pistons. your oil pump needs to be dissasembled and checked for damage the metal might have caused .since you dont yet know what is broke you need to mark the pistons , rods and rod end caps 1-2-3-4 so they go back in the same cylinders they came out of .the pistons have to come out of the top of the block and youll need a ring compressor to put them back. it would proly be a good idea to have your block magna fluxed to be sure there are no cracks on the main jounals or the cylinders and have the block checked for warpage . this is why I suggested you have a machine shop do the rebuild for you ,since you have to take it to them to have these things checked they dont usually charge much for assembling the parts after they have checked and corrected any problems .

[Lizard]

looks like it would be cheaper just to get another engine there joe

[JPAB924]

Hey Joe, if you are gonna go all the way, might as well throw in some eurorace pistons and up your compression while you are in there..

[ This Message was edited by: JPAB924 on 2002-08-22 12:49 ]

[Joes924]

Maybe later cant afford all that stuff..wish wish wish, Ill
I have a motor thats good Ill post a pic. of it maybe this weekend

Heres what happend:

When I took the pistons out after work
the number 1 cyl. cap was a s.o.b. to get off and is to get back on, so its trash either the bolts bent a little or the rod.
This all that came out of the #1 cyl. one half of a bearing the other half dinitegrated,nothing left at all.

http://home.attbi.com/~joedanka/June924/cyl1.JPG

Heres a close up of whats left of the
wrecked bearing.
http://home.attbi.com/~joedanka/June924/badbearing2.JPG

The other 3 bearing caps almost fell of as soon as the nuts were loosend and taken off.
the bearings seem fine no problems.
http://home.attbi.com/~joedanka/June924/pistons.JPG

So thats what happend the #1 cyl. rod bearings disintegrated. Cool huh. I have another motor.he hee - Joe

[ This Message was edited by: Joes924 on 2002-08-22 13:11 ]

[Joes924]

You see whats left of thst bearing nothing only one side that s all weared and chewed on.
Blew me away when I had the nuts loose and it was all sloppy like someone said,then the end cap was tough to get off.

[JPAB924]

Joe what usually happens is that the bearing gets spun. Your crank probably would need to be reground to remove all burrs and to compensate for the smaller dia. you will need to get undersize bearings. Your rod is probably not bent. Just tap it from underneath and pull it out from the topside. as far as the other bearings goe on the other cyls..are they copper colored or are they still lead colored? If they look like copper color it means they are worn also.

[wdb]

I can relate to having to wait . a quick look through the links section I found prices for main and rod bearings and piston rings , comes to about $190.oo . I think you could put these parts on your used engine without any machining . not counting running a honing stone through the cylinders so the rings will seat ,fairly easy to do .
http://catalog.thepartsbin.com/?year=1979&make=PO&imageField.x=37&imageField.y=17

[Joes924]

I picked up whats called a junk yard motor,
compression is good hasnt ran for awhile.
Ill take off the pan and clean it do the head switch with my p&p one and then fill it up with oil and go with it. Thanks for the info site to parts thats great the bearings are still silver.

[-nick]

wdb- when you replace pistons you've got to get them matched to the bores. this is something the machine shop does. the lifespan is going to be much shorter if you don't.

it sounds like Joe has got it worked out. but- there is a good possibility you've got some metal bits in the head. i wouldn't use it until all the oil passages have been cleaned.

good luck
-nick

[wdb]

[924RACR]

Head, clean that head out if you plan to continue to use it; disassemble and wash in the sink w/ dish detergent works very well, believe it or not! I've done that many times, you'd be amazed how well generic dish soap removes oil and grease... like, as well as brake cleaner!

_________________
Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

[-nick]

take it easy wdb, i'm not trying to flame you. did you think the metal bits i was referring to were in your head?!

first i apologize, i thought you included new pistons in your parts list, not just a re-ringing and new bearings.

second, if you didn't know, new pistons out of the box can have variations up to 10 microns (i didn't know this until i started mic'ing them out of the box way back when). while this is acceptable to some, it's easy to account for at the machine shop while you've got it all apart. thus you match the piston diameters to the cylinders. it's not a very complicated extra step if you're putting in new pistons.

-nick

[Joes924]

OOoh you know I dont want to pull valves again,I think Ill wash it with gas then use the soap and blow it out..

Looken down the cyl.on the spun rod it seems theres some wear towards the bottem thats to be exspected the way the bearing went.. have to have it measured Im hoping it wont need to be rebored over,then I need new bigger pistons for sure ..How long do you think that bearing was wearing like that ..awhile is my guess like month or do thay go pretty quicke. The crank is going to have the journal measured and repolished

[wdb]

I took it as you wrote it . your words were clear .

it sounds like Joe has got it worked out. but- there is a good possibility you've got some metal bits in the head. i wouldn't use it until all the oil passages have been cleaned

I'm not upset , It takes more than a play on words to hurt my feelings .
and no I dont think the bits you referred to are in my head